some of the songs that we see are in chord form, so how do we actually fingerpick the chord so that we wont just be strumming the chords? my question is something like improvisation, for example the song, here without u by 3 doors down, the chorous is using chords, C,G,AM,F,so we know that it is in the Cmajor key coz no sharps, but how do we improvise on this? using the scales n aso picking the chords??

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some of the songs that we see are in chord form, so how do we actually fingerpick the chord so that we wont just be strumming the chords? my question is something like improvisation, for example the song, here without u by 3 doors down, the chorous is using chords, C,G,AM,F,so we know that it is in the Cmajor key coz no sharps, but how do we improvise on this? using the scales n aso picking the chords??

A couple of things to say here ...

First, to pick the chord (or play it as an arpeggio), there are various techniques you can use, most revolve around hitting the root note on the beat, then hiting the notes of the chord in sequence up and down and ending back on the root note. You can add extra notes from the chord in and play with the rythm to make it interesting. For this, playing 8ths is usually good enough, doesn't need to be any faster

In terms of improvisation, you need to figure out a scale or scales that fit the chord sequence, then you can really play any note from that scale, although experience will help you make better sounding melodies.

In the example you gave, the chords are all in the key of C major, so a C major scale would work well for improvisation.

As a final step, do the arpeggio stuff, and throw in some runs from the scale and you have an improvised/chord based riff.